UVTRAN is an atmospheric transmission and lidar return calculation module for visible and ultraviolet wavelengths. This EOSAEL module is a transmission code suitable for use in the visible and UV regions with a backscatter code for Mie and fluorescence Lidar return calculations and a sky background radiance code. This propagation model includes attenuation due to molecular scattering, molecular absorption, and particulate attenuation. Gaseous absorption does not differ significantly from that in LOWTRAN 6; likewise the calculated Rayleigh scattering is only slightly less than that of LOWTRAN, with the difference due to our match of more recent values of Rayleigh attenuation coefficients. The major difference in the UVTRAN and the LOWTRAN results in due to the different aerosol parameterizations in the two models. The LOWTRAN models are based on aerosol microphysical models. The UVTRAN model is more directly based on empirical transmission data, with the wavelength dependence of our aerosol attenuation parameterized in terms of the visual range to provide an approximate match for UV and visible horizontal attenuation data. This aerosol model has been compared with the AFGL standard aerosol models and with experimental data on atmospheric attenuation as a function of the visual range. The lidar model calculates the lidar return signal as a function of range for six different lidar wavelengths. The model has the capability of determining backscatter for nominal conditions, for Mie backscatter from an arbitrary cloud, or for fluorescent backscatter due to particles or gaseous molecules. Default lidar system parameters are available, or the user can tailor the system parameters to any particular system. Sky background is also calculated for the wavelength and set of system parameters chosen.

PcEosael Overview
Alphabetical List of EOSAEL Modules
Functional List of EOSAEL Modules

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